http://lanlandy.edublogs.org/2007/07/30/synecdoche/ Adventures on the Mesa Wed, 15 Aug 2007 11:59:47 -0400 http://wordpress.org/?v=2.8.2 hourly 1 http://lanlandy.edublogs.org/2007/07/30/synecdoche/comment-page-1/#comment-27 lanlandy Tue, 31 Jul 2007 04:51:36 +0000 http://lanlandy.edublogs.org/2007/07/30/synecdoche/#comment-27 Excellent point. You're exactly right; due to the vacuum, heat doesn't really move past the cold head. If there *were* air in there, it would turn the whole experiment into a giant ice cube. Since it doesn't really work yet no one completely explained this to me either, but the only way I can imagine that this will work is that the PMT will be placed in thermal contact with the cold head. Another option would be to fill the chamber with liquid neon or argon, and have an additional outer chamber with a vacuum (to prevent the ice cube thing). It's a valid point; I'm not sure exactly what they have in mind... Excellent point. You’re exactly right; due to the vacuum, heat doesn’t really move past the cold head. If there *were* air in there, it would turn the whole experiment into a giant ice cube. Since it doesn’t really work yet no one completely explained this to me either, but the only way I can imagine that this will work is that the PMT will be placed in thermal contact with the cold head. Another option would be to fill the chamber with liquid neon or argon, and have an additional outer chamber with a vacuum (to prevent the ice cube thing). It’s a valid point; I’m not sure exactly what they have in mind…

]]> http://lanlandy.edublogs.org/2007/07/30/synecdoche/comment-page-1/#comment-26 Kate Tue, 31 Jul 2007 04:08:54 +0000 http://lanlandy.edublogs.org/2007/07/30/synecdoche/#comment-26 I have a question about the resistive heating. Are the resistors being used to control the temperature of the chamber? If so, I'm still confused, since the fact that it can't disperse heat in the vacuum was the problem in the first place. Straighten me out? I have a question about the resistive heating. Are the resistors being used to control the temperature of the chamber? If so, I’m still confused, since the fact that it can’t disperse heat in the vacuum was the problem in the first place. Straighten me out?

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